Electric device for managing over time the operation of electrovalves

• US 5,797,417 A
• Filed: 09/27/1995
• Issued: 08/25/1998
• Est. Priority Date: 09/27/1994
• Status: Expired due to Fees

• Current Assignee: Trade Operations & Research Organisation Limited
• Original Assignee: Gilles Delattre, Sylvain Delattre
• Inventors: DeLattre, Sylvain, DeLattre, Gilles
• Primary Examiner(s): CHAMBERS, A MICHAEL
• Application Number:
  US08/533,999
• Time in Patent Office: 1,063 Days
• Field of Search: 137/78.3, 137/624.12, 239/69, 251/129.04, 251/291
• US Class Current: 137/78.3
• CPC Class Codes: A01G 25/16 Control of watering
• CPC Class Codes: Y10T 137/189 Soil moisture sensing
• CPC Class Codes: Y10T 137/86397 With independent valve controller

Abstract

A valve-automatic-pilot couples to electrovalves that control a watering cycle.

The automatic-pilot includes a U-shaped magnetic circuit having two vertically spaced, parallel, and horizontally extending legs. The upper leg of the magnetic circuit carries a permanent magnet. An electrical coil is mounted between the two legs of the magnet circuit with a bottom of the coil abutting the lower leg of the magnetic circuit, with the top of the coil spaced from the top leg of the magnetic circuit, and with an open central axis of the coil extending vertically. A vertically movable retaining block is internal of the coil and is spring biased downward to a valve-closed position. When the block is in its valve-closed and first bistable position, a large air gap prevents the magnet from moving the block upward to its valve-open position. A momentary pulse of coil-current of one polarity moves the block upward to its valve-open and second bistable position. With a small air gap now existing, the magnet holds the block in valve-open position. In order to close the electrovalve a momentary coil-current of an opposite polarity enables the spring to restore the block to its lower valve-closed position. On-site manual operation/programming and remote wireless operation/programming are provided

Claims

1. An automatic pilot for managing over time the operation of an associated valve by way of on-site or remote control of said automatic pilot, said automatic pilot comprising:

a coupling for physically attaching said automatic pilot in operative relation to an associated fluid flow control valve;

a solenoid having a bistable actuator movable between a stable valve-closed position and a stable valve-open position, for respectively closing and opening the associated valve;

a permanent magnet associated with said actuator for biasing said actuator to one of said stable positions;

circuit means including a coil associated with said actuator and operative upon energization of said coil to overcome said biasing of said actuator by said magnet, whereupon said actuator assumes the other of said stable positions;

first means enabling an on-site control input to said circuit means; and

second means enabling a remote control input to said circuit means from a remote location.

2. The automatic pilot of claim 1 including:

a receiver connected to said circuit means; and

a communication interface adapted to couple said receiver to a remote control by means of electromagnetic waves.

3. The automatic pilot of claim 1 wherein said electromagnetic waves are coded electromagnetic waves.

4. The automatic pilot of claim 1 wherein said one of said stable positions is a valve-closed position, and wherein said other of said stable positions is said valve-open position.

5. The automatic pilot of claim 4 including safety means operable to force said bistable actuator to said valve-closed position upon detection of a failure.

6. In a watering system having a plurality of water-flow control valves, a plurality of automatic pilots, one for each of the flow control valves, each of said automatic pilots comprising:

a coupling for physically attaching said automatic pilot in controlling relation to an associated valve;

a bistable actuator movable between a stable valve-closed position and a stable valve-open position, for respectively closing and opening the associated valve;

magnetic force means associated with said actuator for force biasing said actuator to one of said stable positions;

circuit means including an electrically energizable coil associated with said actuator, said coil being operative upon energization thereof to overcome said biasing of said actuator by said magnetic force means, whereupon said actuator assumes the other of said stable positions;

first means enabling an on-site control input to said circuit means; and

second means enabling a remote control input to said circuit means from a remote location by operation of electromagnetic waves.

7. The watering system of claim 6 wherein said coupling is a generally universal coupling.

8. The watering system of claim 6 wherein a plurality of electromagnetic waves are individually coded to a unique one of said plurality of automatic pilots.

9. The watering system of claim 6 wherein said magnetic force means is a permanent magnet.

10. The watering system of claim 6 wherein each of said automatic pilots includes on-site means and remote means for controlling a time duration and a frequency for effecting a watering interval.

11. The watering system of claim 10 including a remote control having a manually operable keyboard and a human readable screen enabling said remote control of said time duration and said frequency for effecting a watering interval.

12. The watering system of claim 6 wherein said coil is pulse-energized to overcome said biasing of said actuator by said magnetic force means.

13. An automatic pilot for managing the operation of an associated flow control valve by way of on-site control or by way of remote control of said automatic pilot, said automatic pilot comprising:

a coupling for physically attaching said automatic pilot in operative relation to an associated fluid flow control valve;

a solenoid having a bistable actuator movable between a stable valve-closed position and a stable valve-open position, for respectively closing and opening the associated valve;

a permanent magnet associated with said actuator for biasing said actuator to said valve-closed position;

circuit means including a coil associated with said actuator and operative upon pulse-energization of said coil to overcome said biasing of said actuator by said permanent magnet, thereby causing said actuator to assume said valve-closed position;

first means connected to said circuit means enabling on-site control input to said circuit means;

second means including a receiver connected to said circuit means enabling a control input to said circuit means from a remote location; and

a communication interface adapted to couple said receiver to a manually operable remote control means by way of coded electromagnetic waves.

14. In a watering system having a plurality of water-flow control valves, a plurality of automatic pilots, one automatic pilot for each of the flow control valves, each of said automatic pilots comprising:

a generally universal coupling for physically attaching said automatic pilot in controlling relation to an associated valve;

a bistable actuator movable between a stable valve-closed position and a stable valve-open position, for respectively closing and opening the associated valve;

permanent-magnetic force means associated with said actuator for force biasing said actuator to one of said stable positions;

circuit means including an electrically energizable coil associated with said actuator, said coil being operative upon pulse-energization thereof to overcome said biasing of said actuator by said magnetic force means, whereupon said actuator assumes the other of said stable positions;

first means enabling an on-site control input to said circuit means;

second means enabling a remote control input to said circuit means from a remote location by operation of electromagnetic waves that are individual coded to a unique one of said plurality of automatic pilots; and

on-site means and remote means for controlling a time duration and a frequency for effecting a watering interval.

15. The watering system of claim 14 including a remote control having a manually operable keyboard and a human readable screen enabling said remote control of said time duration and said frequency for effecting a watering interval.

16. An automatic pilot for managing the operation of an associated valve by way of selective on-site or remote control of said automatic pilot, said automatic pilot comprising:

a coupling for physically attaching said automatic pilot in operative managing relation to an associated valve;

a bistable actuator that is movable between a stable valve-closed position and a stable valve-open position, to thereby respectively close or open the associated valve;

first force means associated with said actuator for biasing said actuator to a first of said stable positions;

second force means associated with said actuator for biasing said actuator to a second of said stable positions;

an electrically energizable coil associated with said bistable actuator;

electrical circuit means for selectively pulse energizing said coil;

said circuit means being selectively controllable to pulse energize said coil in a first manner in order to overcome said biasing of said actuator to said first stable position;

said circuit means being selectively controllable to pulse energize said coil in a second manner that is opposite to said first manner in order to overcome said biasing of said actuator to said second stable position;

to thereby selectively cause said actuator to move between said first and second stable positions;

first control means enabling an on-site control input to said circuit means; and

second control means enabling a remote control input to said circuit means from a remote location.

17. The automatic pilot of claim 16 wherein:

said first force means is a permanent magnet;

said second force means is a spring;

said actuator is magnetically permeable;

said first stable position is a valve-open position in which a small air gap exists between said permanent magnet and said actuator; and

said second stable position is a valve-closed position in which a large air gap exists between said permanent magnet and said actuator.

18. The automatic pilot of claim 17 including safety means operable to cause said actuator to assume said valve-closed position.